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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e8cec798df5dc1ea8149611b70616d140fa7f6d268afd953e966731e82490ad' 
  AND token = '8xzINGblZiOjz9Pr7Utg626dI8rPZAX97LN5HnlEVc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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