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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30915050e3b3a9382d611c7ca242483e96af1e5603db8036ea7c91b61f66eba' 
  AND token = 'IDMLbsR+xvAlJs/a5jA3LcfEIjgyiK5Ukw6yRROp7UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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