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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc4c995c81e528f33475fa33c9c855e040e9a1d3e22eb2254893b4a7c04a619' 
  AND token = 'p8riz2oiBjr2yG4t4a/QLe+TkhC2+rDwighbAM6vWCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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