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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24aebfebccb293c0d0a10ef9f08772cd982156289ab34a3c0b1b2a5b71b8f611' 
  AND token = '39/B4zdfv2Dzp0hk1zOILxGfpJ1fmte4EG5aL2B+bdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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