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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c69e4ccdcbe7ab39d95f9dd9f4a114faaf674f3823df371981636c0fbcf0358b' 
  AND token = '8CGsiqW6OeocH+Dzt9GX3kzNMVW2MSBNRVnE3pxGHXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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