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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3c0aa1cee4992c73358f5faf814807031441eb0ff1044b29d966e6e744768b7' 
  AND token = '/z6vkNc7PXpFvWLnskBp6Z2nAVS992k2H/00y0D/gYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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