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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7a3265418948b43daada615a9a99d54bcce14a4fd3cf7218aa3452083e55e7' 
  AND token = 'RfKGseBdPvX6m2KJsV/iqlk+4IAriYerO35Yu1fbErY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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