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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a9b983d915c1937609a9f58c21082a1ee04120606d77e60672bd55b7ddb7b79' 
  AND token = '3CKIuhtmnnGkUAjbNOCKg8es0WQwPB3gYIlH1TSR6xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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