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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '050d7c3c59cf9cb6e4a4186ab38222afe91b24c7bb45c9f06bdb4b639f78db2c' 
  AND token = '4kGi7fQz/O5FOPCer11jfQrj1PevozUSchI38gEYz1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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