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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5f47fb3e42747db727b6a4c9ec0b1f49ff02fafe160f8cd4efc15b7680ef71' 
  AND token = 'j34XkrFnKRRjxRqMjJOaX9kh+90ECR312+lttt9WeKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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