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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2baa48157298e72a3fb23a887450fc40bce430b103781429c2fffa051768eb69' 
  AND token = 'i8U8ryPvV8K4QhqYpgHdLnoT9pMPYLd8Nxy9Hewrh6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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