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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e324e0f3ce12b8ad6ecbe9f744d86e40ee107021bacbe9ed5a04a124f649634c' 
  AND token = 'f6ndY1FJqhWoCQ4vZss3NujUZU5TKGRXDBSy8cRYMVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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