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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf44d54f0c406cc8569607645f393521a27f6530d2421e6c99340c860b0ac3c' 
  AND token = 'sh5wkcnGrXm+OSfgyl58Sq1cW75b7wF1dXxJGMe+jhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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