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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71c61c89ff038f187a9b391b7879e8861cd50ff2bab2b24e8bae4f2cdcaea25' 
  AND token = 'YdpDvxRGN/2dr8hY0SnzzaixDNhh2t0ao52CfpqRQUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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