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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23d2e7e758e60d0d19005194023a5dedd8accc97cad51d91f00b02718182306' 
  AND token = 'rnVIV3qIZGTigDZngV0vGmMbDgd4SDlS/r2oNeZBv9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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