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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07384bed5dc13af85d7bd159384b0434aa34dd3f76ba97335903b884992ccd11' 
  AND token = 'eIFYVnc58mO6hUCMYUYuxAxEAvmidBo30cdxwyfncqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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