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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c524ab018f8145dd74d011dd1f0600036dcc9cd23dc532c08d5597bbcea87b77' 
  AND token = 'ARcynYigrx+Gi0Nbn25ow2drXk/3k5bKKuCygs3WpfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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