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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4f2df44b2e0f781a89449447857329b2fbde96a971d9cfdfe75c648ab491bd' 
  AND token = 'ux8R/flxblUb4U4rDKvHms5dRHG8Os8BaZY6EQtTbis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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