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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85059f5e21f905a07fc04386fb086dcbc5c245afcd297e7c1b62942dc8205c69' 
  AND token = 'IyHA2VknoGi2l2sMj9ENV8Tl5ENE5hLKlqot2z4Nuik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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