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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7a62ca4735b890c48780f1dd24c5ecfb5ad0d10abe9778bac444b6b415a002' 
  AND token = 'cA9Zo2PCl5gczddZ5C4OBYsywMi9+5h9DoRao7nH73I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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