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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66b02e206f9bbff1bcd362af4abe6c8bce3ce0c143ce75f78837c20c594ada7b' 
  AND token = 'wnaqU8ofy1l6StOa3/W/xJs/eJhS4lts5YphU8tBUT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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