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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2331d4a918da54f0c8e2d4a76165b6ca9fb97aa8af059aae7856d64f93f4ec47' 
  AND token = 'jC3UhstbucuGIq+6dKRzzafN7QoY9Em8BxEkwTGlkOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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