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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393235453264c11d4f2732bfd9c5958519a7d2198fd676ce762593a026742727' 
  AND token = 'e4XszE7SNSL9g/0lIJT+QyZjTxgOAyvxNVv5uzEMaK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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