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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fe383bb7c310b6116402c6c32b64fde4ccf8fe637d261f4a0b674e7fe7e9b47' 
  AND token = 'Nr/+4YYRSTlIAgss+qmVwFWopix99s4ZR+aSEkU6Iwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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