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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1656ba0d8403c97829d28436297a0a3ca20458d923f9ea683abe4682268f43ff' 
  AND token = 'XQ1jjlVGh5AYnj6oY7RbG8lr62oA0VpPJrJRhayPtVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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