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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7935cb251f3dc446867e23b943d66ccb35815ff69dc719b545a4d5f8c3c60351' 
  AND token = 'y6T5cnbLb0je8sUi0X4e432TvOG4RXqrDdWF/jrR9mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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