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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9aef99e7e0df4ab1beae5309bd2c148c3b8155eb31ffbbabdb3b33ffa43c434' 
  AND token = 'Wbacnv7dmBtqZymXbMpVgSD5ESHF4QSIsbZ1U7g0Cwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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