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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adb158f1712f613ab1acac52c4743b45dc089bb41ef8a8e914bcce4b9ddde9e' 
  AND token = 'zDz4aYQ+J21TJuw2fAe8tA7X4GrM1ZmrEe/DXOxLvgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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