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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9441be455c2c91700a74bb3741bdc1d2b5059de90e2ffb547658fd487adf830f' 
  AND token = 'lbskSNBm0UN4b2JPqj4vefoWIzpROhh+8X+UdTCf7Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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