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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9221eea6f94be8baefbb265b9b656bcc923f89c3c8bf8ad52ebe384a9e4fe6e' 
  AND token = 'h+LFDa7QCnE5/F7Mtzv219rGxsg4MssVyF6Unvqh6mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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