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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f463adc3ee1ec05a2c3fe479ed3b3cb9244848bd286d7e9eda9bbb5f568ca96a' 
  AND token = 'dbz439YRc9YU2UdpkgjQSPaWPhb4Te63nz+UInBCb0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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