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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1548d6500594082d2a91adad736b8d6b2e24bb2d8bbd80e0359ea72c1c28713a' 
  AND token = 'd6/VdhlY9rxtYxU8VKeLm3ZRwMB3tTNJV/8M1IaagtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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