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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dde331bd82f3a473c9da16676600d8d80bf72f38df83316f291af5d1e810673' 
  AND token = 'kUxtzejcQPjJzWRSAMwr232IcTlqNYRjuitRGlAggws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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