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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c73f400d602a08cea37c1ff788187b2777fd94c1a53b29e52135babcb6d56ea' 
  AND token = 'uRU6nHh0BijkP+p6UCm8Je+xi2X8F9soobRHsCD01ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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