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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c023e94b1730d97505b1c3b3f085e9ef26825d48d343341b431b48a0f963379b' 
  AND token = 'RmjqET+JKcyZy5QOeK0XCmd66zkuOl4as0OK5kuz9Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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