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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c25c37042e1c5029d020fd7367b5e8d4e70e532c4d9b4df4a4893d9e0361ad' 
  AND token = 'oUJqVu8OScWyFuPIbEk23rMYJG0gx/EbCOKMHDP2/3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}