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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bbce4baa1bcec0117df25bb829f7391dd013a6b3a0a57e51647912e281b5f6' 
  AND token = 'XHo3JzUQnk3mR3WltroPjrX+zrj8fQHkwHfyLLUxMk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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