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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2962d76eae9aede15ce3e2daa4b88a436ae0a18470ac4b97ce902d0c7015402a' 
  AND token = '8OLNnkX29J4REVaAIhDi3LzV2PKzfZ6hDE7LAFAl98A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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