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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a671a44348f41271bd09cbc1ed84dd685aa94b5c0c417a9201104049092f2c98' 
  AND token = 'RXvfHn/bHUfEmAQN8UeSEKvuDLM6Mzd4Do6w9K8Pa7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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