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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09677adcf8afc97a5da0e36d05268013f744c9538d2c022bf72cd75cda5dbde4' 
  AND token = 'e564hVpo9BIodffHkm6E0GiVIy6pWgf2EDG60BaaWUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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