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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db5c7e3d174a1b5b64f6394db36266677e522e59639d9eef3156548fcf5ab6fb' 
  AND token = 'Tx4MB8SrBr/YPEz2lf6+meMGApqzs16R6vAZokfIFgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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