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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '865db6c49efde6b8b7b51f77c752676abe86334823ceff4ceb0908fa51b3a987' 
  AND token = '3A79+exFe4n6DAaOpKGWNQQ9hgii0skS89maTi88ASc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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