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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38cc89a068b65c1480a2fe7280be9761c18608f4519bcc3a2343f2b282f9bdb8' 
  AND token = 'xSFk4nY522kjtJ1C6tVTPJVstrDyEGcfN9a/EIIhBxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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