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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a911c745411f527d739424c6ef63089edac61b21b75a7b4442512daad3f611b5' 
  AND token = 'h6AaT7hfmnBq+4mf4c0IjlxOUERORiwkPyAkeebWKpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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