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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ccbf74630b8f77967c16c771c12320198528d68ab31ba98966182420f4109ad' 
  AND token = 'aEf8N4B2EMv5tQsBhKBMapVH1OZxYqi+T/e04zECSTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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