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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8eae92a412b7c1ac43a57f76e5d5e72f103d5e634a1e09f4f99a6dc53d60b3' 
  AND token = 'B/P77R9mEJkRO7VJTd2enEeq23PAlpK4Z3XO4Zys98I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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