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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690a1e16323f5446707efe059cfdc6156d98c8ea24df59917d7f97369a1b71ef' 
  AND token = 'bJCpI3GTrdPFbZTD4zxHN7k05SswKEG94fJHzhHuB/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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