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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a11136e0f93de130c140dc2ea1c38bbd1c7d63b00ccee43e489dcd6d2240d4a' 
  AND token = 'qU/WgN+kof6+pW5JrpbMDR+Z/TBJ0mjeyDk39JBxWVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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