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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d189de4bc26b603a67b10d64556c1cb1818fcfa200164ba69655dcea4452e5' 
  AND token = 'xu8ZHsD6qKuCjX8zak/N+VRS5E9jh4AA0CF20XHkIsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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