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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc96a7bb4929a33136fa6a10ed5dc665d66d39a5ec9a6cf25135f00d1589973' 
  AND token = '2iVjW1KNuMDAM9cXEqmeM7yYrlLRHh+raOg44ILzcW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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