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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a1fdc57563acada22696b15497b340f2bde910a8d3bf24a2500c50d6d17c72b' 
  AND token = 'IwkiHXJlwDpAgp88avseUImubUp6dbFd2YUalS6N7J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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