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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca1d1657485cdf2a3f7238482f7b00dbe82813a93f13613d4413656702c7244d' 
  AND token = 'xGUy8KrH/0V2D+ALVR8epCedMJJdRr6i06WFa0tqlWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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