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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1441d797cad9c405cf72a90a8cc2f8cba8c8df202b448af001c462ebb33e555' 
  AND token = 'kZVDickdC7VGMW5WRCaPkE8X81dyT0Y83AKCbHBehQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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