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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcf9ec1f9415237e96ae5f7385eba419e3b05ba12bd4a24e2b1caa6a4773247b' 
  AND token = 'lk3mGPRl24zLHlHTIEhAAGhaXFjYqXyCGrnxt7KPCnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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