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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4720e804164da8415d08ab11c304e0b2deb4ce2bb2eb7010598112e448e9e3' 
  AND token = 'IQ3St20yIghJqRKRORSk7xRGU2qlYHD0Ke/Yaf5BWfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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