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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '539e1fe09fffda55a9cd4efef04c69df8abae096d40ccbac00b6ef0885713a0b' 
  AND token = 'wb0O+MO8Q1+gJLvccT4cnX4LhzYtGvSbXB8eXWBkmZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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