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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0bcff392ab47bb83eeff722e0d728d7208c6e13f1c6738181aef045c124987' 
  AND token = '55iO26qLmFVazJ3kEcAx/E2yWpBMbJBmBdEhKsbvVlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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