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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff3c808c8162270d90d844d6f4bbaa337a7524c8058bf5c705ddaa476611a74' 
  AND token = 'W5iqnPDSqkzkzvK3PmUjkE7gCCdtwVayI9cBkbDH4rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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