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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db1c908b653cc3f6836476b8fc9307619205d61f77d60daeff17b07fd3f875c' 
  AND token = '0fax0khvUh188tOsQh7AQBlLHYjtBefwseIKR+Qd7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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