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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136581d0325f2719a741f5c58f96c13674d41a9faf3bd4cc7d9b963874ca0334' 
  AND token = 'xBL3Mp501pIA5iBY3pqpE3Jy/G16NXDE54MK1A2wzXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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