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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d5d6366cd8d74de1282c90e1b325ef9c6864353251dfcc1eea6975a07d0398' 
  AND token = 'ZARK+x6rSoqq/gk+qLSGWmEhKaAfiNo+lck1HF0o9AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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