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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2af1169521de893c2c3148b032d1404a81e19fdbc6dcaab63b61ef48fe17326' 
  AND token = 'J2KFMq1Ja0VuTBx92QMXF+UcAGnddAT+hGyXuaK290c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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